TACOMA - Masters champion Jordan Spieth believes he has an edge over his rivals at the US Open as he seeks a calendar-year golf sweep.

The second Major of the year begins tomorrow at the Chambers Bay Golf Club, which is hosting its first professional event so few players can say they have spent considerable time on the course.

The links-style layout will be a mystery to most but Spieth has played here once before - at the US Amateur in 2010.

The real ace up his sleeve, however, is his caddie, Michael Greller, who worked at Chambers Bay before carrying Spieth's bag on the PGA Tour.

"Michael told me some shots that I needed to get ready for Chambers," said the American. "He walked it a couple of times a few weeks ago.

"I need a shot I can trust from the run-off areas. The greens are massive, so controlling your speed on these longer putts, you are not going to be able to feed it into a lot of these pins."

Even without any insider's knowledge, the world No. 2 would have been one of the favourites. He has played 16 PGA Tour events this season and along with his victories at the Valspar Championship and Masters, he has three runner-up spots and nine top-10 finishes.

The 21-year-old said he feels good about his first half of the season but has loftier ambitions. Spieth wants to become the first golfer in the Masters era to win all four Majors in the same year.

"I have a chance to make history in many ways," he said. "You can't win a Grand Slam unless you win the first, so I'm the only one with that opportunity this year. I'm going to go ahead and focus on this week and see if I can put myself in contention."

AGENCE FRANCE-PRESSE